Trimming mechanism of stereotype-casting machines.



N0. 809,524. PATE-NTED JAN. 9, 1906.

T. M. NORTH.

TRIMMING MECHANISM OF STBREOTYPE GASTINGMAGHINES.

APPLICATION FILED FEB. 20. 1905.

m Irma/W flXw/MJKMM MMM UNITED srar s PATENT OFFICE.

THOMAS M. NORTH, OF LONDON, ENGLAND, ASSIGNOE TO LINOTYPE AND MACHINERY LIMITED, OF LONDON, ENGLAND.

Specification of Letters Patent.

Patented Jan. 9, 1906.

A lication filed February 20, 1905. Serial No. 246,607.

To all whont it may concern:

Be it known that I, THOMAS MERRIFIELD NORTH, of 188 and 189 Fleet street, in the city of London, England, have invented new and useful Improvements in Connection with Means for Automatically Casting Stereotype Printing-Plates; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement in trimming mechanism of stereotype-casting machines, and is more particularly applicable to the machine described in the s ecification of Letters Patent No. 721,117, led March 4, 1898, and tothe means for driving the trimming-saws of such machine.

In the machines as made under the abovenamed patent the saws are driven by a belt which receives motion from a pulley on a certain shaft. In the event of an accident happ ening before the cylinder with the newly-cast plate on it had turned far enough to bring the latter into position for being carried forward to the saws the operator throws the drivingbelt off, thereby stopping the entire machine, and completes the turning of the cylinder by hand. If the belt is now thrown on again, the machine will start the plate toward the saws; but these latter will not have acquired sufficient momentum by the time it gets to them to enable them to do their work. Under these circumstances the practice has grown up of taking the plate out of the machine, although it may be a good one, and remelting itand casting another one.

The object of the present invention is to overcome these difficulties, and the means for obtaining the said result are illustrated in the accompanying drawing, which is to be taken as part of this specification and read therewith and which represents a sectional end elevation of the machine.

In the arrangementillustrated the first motion-shaft 61 instead of, as has hitherto been the practice, being formed in one iece and driven directly from the motor is ormed in two parts 61 and 62, which are capable of being engaged with and disengaged from each other by means of a friction or other clutch 63, the shaft part 62 receiving its motion from the motor through a belt running upon a pulley 64 or by other suitable means. The means employed for transmitting motion from the shaft part 62 to the saws 53 54 is practically identical with that hitherto used or transmitting the motion from the first motion-shaft 61 to the said saws, these means comprising a pair of bevel-wheels, of which only the one marked 65 is shown, a horizontal shaft 66, (shown in dotted lines,) and a pair of bevel-wheels 67 68, the former fast on the horizontal shaft 66 and the latter fast on a vertical shaft 69. On the upper end of the shaft 69 is secured a pulley 70, around which passes a belt 71, passing also around a springcontrolled jockey-pulley 72 and the pulleys 73 74, fast on the saw-spindles 55 56, respectively.

It will now be seen that, assuming that the pulley 64 is being rotated during the normal working of the machine, the whole of said machine will work in the usual manner when the clutch 63 is closed. If, however, it should be necessary-to stop the casting mechanisin, this may be effected by opening the clutch 63, which will secure that result without also arresting the motion of the saws 53 54, so that when the casting mechanism shall be next restarted the saws will be ready to deal with the casting next presented to them.

It will be noticed that the two saws 53 54, like those previously employed in the same class of machines, are arranged indifferent horizontal planes. This arrangement arises out of the'fact that in such a machine the saw 54 is required to trim at one level an edge of the stereotype-plate which is already substantially true and finished, whereas the saw 53 is required at a higher level to sever from the said plate the part which in the above named specification is referred to as the (K tail 2).

I claim- In the trimming mechanism of apparatus for automatically casting stereotype printed to engage and disengage the two said parts ing-plates, the combination of the trimmingwith and from each other. saws, a shaft adapted to rotate the saws when In witness whereof I have hereunto set my itself rotated, a two-part first-driven shaft hand in the presence of two witnesses.

5 one part in constant operative connection THOMAS M. NORTH.

with the first-named shaft and the other part Witnesses? in constant operative connection with the HENRY HART,

plate-moving mechanism, and a clutch adapt- WARWICK HY. WILLIAMS. 

